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Quantitative analysis of the influence of voids and delaminations on acoustic attenuation in CFRP composites by the laser-ultrasonic spectroscopy method
Affiliation:1. International Laser Center, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia;2. Faculty of Physics, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia;1. Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China, Beijing 100095, China;2. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China;1. XARION Laser Acoustics GmbH, Vienna, Austria;2. Department of Chemical Engineering Materials Environment, Sapienza-Università di Roma, Roma, Italy;3. Pprime Institute, CNRS-ENSMA-Université de Poitiers, Department of Physics and Mechanics of Materials – ENSMA, Futuroscope Cedex, France;4. Institute for Polymers, Composites and Biomaterials (IPCB), National Council of Research, Pozzuoli, Naples, Italy;5. Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Naples, Italy;6. Airbus Operations S.A.S., Toulouse, France;1. Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8540, Japan;2. Aerospace Company, Kawasaki Heavy Industries, Ltd., Kakamigahara, Gifu 504-8710, Japan;1. University of Augsburg, Institute of Physics, Universitätsstr. 1 Nord, 86159 Augsburg, Germany;2. Institute for Materials Resource Management, Mechanical Engineering, Universitätsstr. 1, 86159 Augsburg, Germany;1. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, 92 Weijin Road, Tianjin 300072, China;2. Schlumberger-Doll Research, One Hampshire St, Cambridge, MA 02139, USA;3. Institute of Advanced Digital Technologies and Instrumentation, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou 310027, China;4. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
Abstract:The aim of the present work is to develop the ultrasonic spectroscopy method using laser thermoelastic generation and piezoelectric detection of broadband acoustic pulses for quantitative evaluation of the influence on the ultrasonic attenuation coefficient of microscopic dispersed voids and interply delaminations in CFRP laminates. The specimens under study have different entire porosity values up to 10% determined by the X-ray computer tomography. The ultrasonic attenuation resonance is observed in all specimens governed by their periodic layered structure. The absolute maximum and the frequency bandwidth of the resonance peak depend on the total porosity level formed by the predominant type of imperfections, either of only microscopic spheroidal voids entrapped in the epoxy layers or of additional extended interply delaminations. The derived empirical relations between these parameters and the total porosity level can be used for rapid nondestructive evaluation of the structure of CFRP composite laminates subject to different manufacturing conditions.
Keywords:A  Layered structures  B  Delamination  B  Porosity  D  Ultrasonics  Attenuation coefficient
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